Flow rate = Number of transactions in a block / number of transactions in mempool at time of block * 100.
This is quite different than txns per second, because it's independent of usage.
I imagine BCH will strive for 100%, and on BTC as flow rate goes down, fees ought to go up.
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source https://www.reddit.com/r/btc/comments/f2pbso/can_we_get_block_explorers_to_show_a_new_stat/